diff --git a/.github/workflows/claude-plan-to-issues.yml b/.github/workflows/claude-plan-to-issues.yml
index c50e7a4..36a6541 100644
--- a/.github/workflows/claude-plan-to-issues.yml
+++ b/.github/workflows/claude-plan-to-issues.yml
@@ -135,7 +135,7 @@ jobs:
           echo "task-count=$TASK_COUNT" >> $GITHUB_OUTPUT
 
       - name: Upload plan JSON artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: validated-plan
           path: plan.json
@@ -374,7 +374,7 @@ jobs:
             core.setOutput('skipped-issues', JSON.stringify(skippedIssues));
 
       - name: Upload issue creation results
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: issue-results
           path: |
diff --git a/.github/workflows/dev-to-main.yml b/.github/workflows/dev-to-main.yml
index acfb221..7ab8ccd 100644
--- a/.github/workflows/dev-to-main.yml
+++ b/.github/workflows/dev-to-main.yml
@@ -141,7 +141,7 @@ jobs:
           fi
 
       - name: Upload production build
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: production-build
           path: |
@@ -202,7 +202,7 @@ jobs:
 
       - name: Upload smoke test results on failure
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: smoke-test-results
           path: |
diff --git a/.github/workflows/reusable-pr-checks.yml b/.github/workflows/reusable-pr-checks.yml
index 028a035..b15a2ac 100644
--- a/.github/workflows/reusable-pr-checks.yml
+++ b/.github/workflows/reusable-pr-checks.yml
@@ -165,7 +165,7 @@ jobs:
 
       - name: Upload lint results on failure
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: lint-results
           path: |
@@ -203,7 +203,7 @@ jobs:
 
       - name: Upload type check results on failure
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: typecheck-results
           path: |
@@ -242,7 +242,7 @@ jobs:
 
       - name: Upload test results on failure
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: unit-test-results
           path: |
@@ -253,7 +253,7 @@ jobs:
 
       - name: Upload coverage reports
         if: always()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-reports
           path: |
@@ -292,7 +292,7 @@ jobs:
 
       - name: Upload integration test results on failure
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: integration-test-results
           path: |
@@ -363,7 +363,7 @@ jobs:
 
       - name: Upload mobile build results on failure
         if: failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: mobile-${{ matrix.platform }}-build-results
           path: |